Universal portable tool



Sept. 17, 1963 Filed June 21, 1960 W. J. KEHALY UNIVERSAL PORTABLE TOOL 4 Sheets-Sheet l Sept. 17, 1963 w. J. KEHALY 3,103,676

UNIVERSAL PORTABLE TOOL Filed June 21,1960 4 Sheets-Sheet 2 Sept. 17, 1963 w. J. KEHALY UNIVERSAL PORTABLE TOOL 4 Sheets-Sheet 3 Filed June 21, 1960 Sept. 17, 1963 w. J. KEHALY 3, 7

UNIVERSAL PORTABLE TOOL Filed June 21. 1960 4 Sheets-Sheet 4 United States Patent 3,103,676 UNIVERSAL PORTABLE TOOL William J. Kehaly, 19 Rutledge St., San Francisco, Calif.

' Filed June 21, 1960, Ser. No. 37,777

Claims. (Cl. 10--89) This invention relates to improvements in portable tools and more parttic-ularly relates to an improved form of power driven tool arranged to selectively perform a series of operations on pipe, ro'ds, bolts and the like.

A principal object of the invention is to provide a simple and improved form of universal portable power tool arranged with a view toward adaptability of the tool to perform a large variety of operations on pipe, rods and the like.

Another object of the invention is to provide a novel and improved form of universal tool which may be held by the hand during operation of the tool and is so arranged that the object being worked upon may pass through the rotor of the drive motor for the tool.

A still further object of the invention is to provide a universal threading and cutting tool for pipe and the like, which may also internally ream pipe or sleeves of various kinds and is adaptable to tighten or loosen pipe joints and other threaded objects. A

-A still further object of the invention is to provid an improved form of universal portable power tool in which the casing for the tool encloses a motor having a hollow rotor and has a series of stationary retainers projecting from one side thereof and a series of rotatable retainers projecting from the opposite side thereof and rotatably driven by the hollow rotor, in which theretainers on one side of the rotor may detachably support a holding tool or chuck while the retainers on the opposite of the rotor may detachably support a die stock and the like.

Still another object of the invention is to provide a portable universal power tool for selectively performing a series of operations on pipe, rods and the like in which the motor for the tool has a hollow rotor through which an article may pass during the operation of threading, cutting or reaming the article, in which stationary retainers project from one side of the motor about the hollow rotor and rotatable retainers project from the opposite side of the motor about the hollow rotor, and in which a geared drive connection is provided to drive the rotatable retainers and includes a change speed disc mounted on the stationary retainers and having drive gears rotatably mounted thereon, adapted to eflect a drive to the rotatable retainers at one speed when the disc is in one position on the stationary retainers, and to 'drive the rotatable retainers at a different speed when the position of the change speed disc on the stationary retainers is reversed.

A still further object of the invention is to provide a portable universal threading and cutting tool having stationary retainers projecting from one side thereof and rotatable retainers projecting from the opposite side thereof, in which the chuck for the object to be worked upon may be detachably mounted on either the stationary or rotatable retainers and consists in a rolling lock adapted to have gripping engagement with the object to be worked upon, and accommodating axial movement of the object, but preventing rotational movement thereof.

Still another object of the invention is to provide an improved form of chuck having a series of radially movable chuck members having rolling locking discs on the ends thereof adapted to have biting engagement with an article to be held, together with an impact disc for en- A still further object of the invention is to provide a portable universal tool particularly adapted to thread and cut pipe and the like in which the drive motor for the tool has a hollow rotor through which an article being worked upon may pass during the operation of working on the article, and having stationary retainers projecting from one side thereof about the hollow rotor and rotatable retainers driven from the hollow rotor and projecting from the opposite side thereof about the hollow rotor, in which the handles for the tool are hollow and accommodate the placing of switch means and control means for the drive motor therein. I

A still further object of the invention is to provide a novel and improved form of portable threading and cutting tool including a casing enclosing a motor having a hollow rotor, through which an article being worked upon may pass, and having stationary retainers projecting from one face of the casing for detachably holding a chuck and the like with rotatable retainers projecting from the opposite face of the rotor for detachably holding a die stock, for cutting or threading tools and the like.

A further object of the invention is to provide a univ rotatable retainers projecting from opposite sides thereof with a hollow rotor through which the material being worked upon may pass, and having an improved form of cutter adapted to be detachably mounted on either stationary or rotatable retainers.

Still another object of the invention is to provide an improved form of reamer for mounting on a universal threading-and cutting tool for reaming pipe, sleeves and the like.

Still another object of the invention is to provide an improved form of threading die stock for detachably mounting on a universal portable cutting and threading tool to perform a threading operation on pipe, rods and the like.

These and other objects of the invention will appear from time to time as the following specification proceeds and with reference to the accompanying drawings where-' in order to show the upper half of the tool in transverse gaging the rolling locking discs with the article with an 7 impact sufiicient to bitingly engage the rolling locking discs with the article to hold the article from rotation and accommodate axial movement of the article.

section;

FIGURE 3 is a fragmentary end view of the tool shown in FIGURE 1 with certain parts broken away in order to show the reduction gearing for selectively driving the drive socket for the tool at a plurality of speeds;

FIGURE 4 is a detail view of the speed selecting disc shown in FIGURE 3;

FIGURE 5 is a view in side elevation of the speed selecting disc shown in FIGURES 3 and 4 and showing the drive gears rotatably mounted therein in dotted lines;

FIGURE 6 is a view in side elevation of the chuck or locking device, with certain parts thereof broken away and certain other parts shown in section in order to illustrate certain'details of the invention;

3 FIGURE 7 is a sectional view taken substantially along the line VII-VII of FIGURE 6;

FIGURE 8 is an end view of the threading die stock mounted on the stationary retainers for the tool, with certain parts broken away in order to show the adjustable rotational movement with respect thereto.

certain parts broken away and certain other parts shown in section in order to illustrate certain details of the adjusting means for the cutting dies and showing the cutting die stock mounted on the portable tool;

FIGURE 11 is a fragmentary sectional view of the cutting die stock, showing the die stock mounted on one set of retainers for the tool, and taken substantially along the line XI-XI of FIGURE and FIGURE 12 is a view in side elevation of a reamer constructed in accordance with the invention, with certain parts thereof broken away and shown in section, in order to more clearly illustrate the details of the reamer.

In the embodiment of the invention illustrated in the drawings, I have shown in FIGURES 1 and 2 a casing 11 for a motor 12, herein shown as having a stator 13 and a hollow rotor 15 journaled within said stator for I have also shown a drive socket 16 extending outwardly of one side of the rotor 15, adjacent an end wall 17 thereof, with ball thrust bearings 18 interposed between the inner wall of said socket and the end wall 17. The drive socket 16 has a sleeve portion 119 extending inwardly therefrom through the hollow rotor 15 and suitably journaled thereon on a bearing 20, which may be in the form of a roller or needle bearing of a well known form. The end of the sleeve 19 opposite the drive socket 16 has an external ring gear 21 thereon, which may be formed integrally therewith for driving sleeve 19 and drive socket 1-6 from the rotor 15 at a slower speed of rotation than the speed of rotation of said rotor, through change speed gear trains, which will hereinafter be more clearly described as this specification proceeds.

The drive socket 16 has a plurality of retainers or dowels 23 equally spaced about said drive socket and extending outwardly therefrom parallel to the axis of said drive socket. The dowels or retainers 23 form drive means for die stocks or chucks and the like and are shown in FIGURES 10 and 11 as having a threading or cutting die stock 22 detachably mounted thereon and retained thereto by spring clips 24 engageable with outer grooves 25 extending about the retainers 23. The retainers also have inner grooves 26 formed therein, inwardly of the grooves 25. If desired a spring clip or snap ring may be placed in each inner groove 26 to limit inward movement of the die stock while a spring clip or ring may be placed in the outer groove 25 to retain the die stock in position. The spring clips 24 may be placed in the grooves 26 when the die stocks are so constructed as tofit entirely Within the socket '16.

The opposite side of the casing 11 from the socket1'6 has an end plate 27 mounted thereon and spaced from said casing by a spacer 29, shown as being of a modified, octagonal form, and forming a peripheral wall for a housing for reduction gearing 30 for driving the sleeve 19 from the rotor 15 at a plurality of selected speeds, as will hereinafter more clearly appear as this specification proceeds. The end plate 27 conforms to the form of. the spacer 29 and has an inner internal flange 31 extending inwardly from the inner margin thereof and forming a continuation of the sleeve 19. The end plate 27 also has a plurality of stationary retainers or dowels 33 projecting therefrom and adapted to have a chuck or the like detachably mounted thereon for holding an article being worked upon from rotation. The stationary dowels 33 have inner and outer grooves 35 and 36, to receive snap rings or spring clips like the spring clips '24, and retain various desired holding devices or tools thereto.

It may be here seen that a chuck mounted on the retainers 33 may hold the pipe, rod or the like from rotation While a die stock having threading or cutting dies may be mounted on the rotatable retainers for threading or cutting a pipe. It should be understood, however, that if desired the chuck may be mounted on a rotational retainer and a die stock may be mounted on the stationary retainers, the chuck rotatably driving the pipe or rod or other article being worked upon.

The casing 10 also has two hollow handles 37 and 39 projecting therefrom in diametrically opposite directions. The hollow interior portions of the handles 37 and 39 may form wells for capacitors (not shown), where the motor 12 may be a single phase motor. The handle 37 is shown as having a switch ring 46 guided for movement thereabout. The switch ring 40 has an inwardly extending leg portion 41 extending within the handle 37 in a direction generally parallel to the axis of said handle and having connection with a generally cylindrical member 43 having a series of movable contacts 44 thereon. The movable contacts 44 are adapted to engage stationary contacts 45 on a stationary cylindrical ring 46 suitably mounted within the handle 37. The switch ring 40 may thus serve as an on and off and reversing switch and may also serve to change the speed of rotation of the motor 12, by changing the stator winding connections, where the motor may be a two speed motor.

It should here be understood that the motor 12 is preferably a reversible alternating current motor of the squirrel cage type, andmay be either a single phase, a two phase or a three phase induction motor. The stator windings may be connected by certain of the contacts 43 and 45 to effect various output speeds of the rotor 15 as desired, in a manner similar to that shown and described in my Patent No. 2,913,236 dated November 17, 1959, and forming no part of the present invention, so not herein shown or described further.

Referring now in particular to the change speed drive mm the rotor 15 to the sleeve 19 and socket 16, said rotor has a side frame member 47 having a flanged portion 49 projecting outwardly therefrom and having an external ring gear 50 formed integrally therewith. The ring gear 50 meshes with and drives a gear 51 on a shaft 52 journaled in the casing 11 at one end and in cover plate 27 at its opposite end. A pinion 53 is suitably secured to the shaft 52 and meshes with and drives a gear 55 on a shaft 56 having a pinion 57 suitably secured thereto. The pinion 57 in turn meshes with an idler pinion 58, which meshes with a gear 59 on a shaft 62 having a pinion 54 suitably secured thereto. The pinion 54 meshes with a gear 60 on a shaft 61 having a pinion 63 suitably secured thereto.

The gear 60 and pinion 63 form drive gears for high and low speed drive trains. The high speed drive train includes a pinion 64 meshing and driven from the gear 60 and driving an idler pinion 65. The idler pinion 65 may mesh with and drive a drive pinion 66, shown by dotted lines in FIGURE 3 as meshing with the external ring gear 21.

The pinion 63 meshes with and drives a gear 67 on a transverse shaft 69 having a pinion 70 suitably secured. thereto. The pinion 70 in turn meshes with an idler pinion 71, shown in FIGURE 3 as meshing with and driving a drive pinion 66 meshing withand driving the gear 21.

Four sets of drive trains are provided for driving the external gear'21 from the gear 50 at either a high or low speed, one set of said drive trains only being herein shown and described, in order to simplify the drawings and description. As shown in FIGURE 3, two .drive pinions 66 are provided for each set of high and low speed gear trains, one drive pinion 66 being driven from the idler pinion 65 to drive the gear 21 at a relatively high rate of speed and the other drive pinion 66 meshing with the idler pinion 71 to drive the gear 21 at a lower speed.

The drive pinions 66 are journaled in a change speed disc 73. The change speed disc 73 is shown in FIGURE 4 as being annular in form and as having enlarged generally segmental boss portions 74 extending from opposite sides thereof, having holes 75 therein, which may contain bearings (not shown) for shafts 76 extending from the drive gears 66.

The change speed disc 73 also has four equally spaced holes 77 extending there-through, adapted to fit on the stationary retainers or dowels 33 and be held in position thereon by spring clips or like retainers (not shown). The segmental bosses 74 register with and fit through corresponding apertured portions (not shown) in the end plate 4-7, and when the change speed disc 73 is in the position shown in FIGURE 3, one drive pinion 66 will mesh with an idler gear 71 of one slow speed drive train while the other drive pinion 66 will mesh with another idler gear 71 of an adjacent low speed drive train.

When it is desired to increase the speed of rotation of the gear 21 and the socket 16, the change speed disc 73 is removed from the dowels 33 and inverted on said dowels. The drive pinions 66 are also removed from the bearings in the change speed disc 73 and placed in said hearings to project from the opposite face of the change speed disc 73 from the face shown in FIGURES 3 and 5. This will position the drive pinion-s 66 to mesh with the idler pinions 65 of each gear train, for driving the gear 21 and socket 16 at a relatively high rate of speed, when the change speed disc 73 is placed on the dowels 33.

It may here be seen that a simplified form of change speed mechanism has been provided, which may change the speed of the tool .in addition to the various motor speeds that may be obtained, and requires no shifting collars or mechanisms, and is so anranged that a change in speeds may be attained by merely inverting a change speed disc on the dowels 33, and inverting the drive pinions with respect to said change speed disc.

Referring now to the rolling chuck shown in FIGURES 6 and 7, said rolling chuck comprises an annular casing St) including parallel spaced annular end plates 81, connected together in spaced apart relation with respect to each other as by machine screws 32. The plates 31 are shown as having four jaw members 83 suitably guided therebetween for radial movement with respect thereto into an inner open portion 85 or" the casing 80. The jaw members 83 have bifurcated inner end portions 86 extending along opposite sides of an annular internal gear S7, and having rack teeth 83 cut therein. The rack teeth S8 of each jaw member 83 mesh with a separate pinion 89, jo-urnaled at its end in the end plate 81. The pinion 89 in turn meshes with and is driven from the internal gear 87.

The jaw members 33 each have a series of discs 99 recessed therein and rotatably mounted on a pivot pin 91, mounted at its end in said jaw members and extending transversely of the axis of the chuck. The discs 93 have V-shaped peripheries adapted to have biting engagement with an article being worked upon, such as, a pipe or nod, and retaining the article from rotation hut accommodating linear movement of the article along the sleeve 19 and socket 16.

The casing 80 also has four uniformly spaced holes 93 extending through the end plates 81, of substantially the same diameters as the diameters of the dowels or retainers 33, to accommodate the chuck to be mounted on said dowels or retainers. It will be understood, however, that if desired the chuck may be mounted on the rotary retainers 23 w lere it may be desired to rotate a pipe or rod, as where it may be desired to interiorly ream a pipe or loosen or tighten a pipe connection.

The internal gear 87 is rotatably driven through an annular impact disc 95 extending about the end plates 811 and having a bifurcated portion 96 extending inwardly between said end plates. A series of pins 97 extend transversely through the furcations of the bifurcated end portion 96, and through slots 99' in the internal gear 87. In FIGURE 7 two pins 97 are shown although it may readily be understood that any number of pins desired may be provided.

When it is desired to engage the discs 90 with an article to be held, the impact disc 95 is turned in a direction to engage the V-shaped peripheries of the discs 90 with the article. The impact disc 95 is then reversed to move the pins 97 along the slots 99 and is sharply moved in an opposite direction to engage the pins 97 with the end slots 99 with an impact, and set the discs 94) into biting engagement with the article to be held from rotation. When it is desired to release the discs 90 it is merely necessary to strike the impact disc 95 in an opposite direction until the discs 90 are released. The chuck may then be spun to a wide open position.

In FIGURES 8 and 9 lrhave shown a generally annular die stock 1% having a series of threading dies 101 adjustably mounted therein, for radial movement with respect thereto. The die stock 160 includes a pair of spaced plates 103 suitably connected together in spaced relation with respect to each other and having four equally spaced holes 1% extending .therethrough, shown as being mounted on the rotatable dowels or retainers 23. The plates 163 have the dies 101 guided therein for radial movement with respect thereto in radial guides 102. The dies [101 have rack teeth 105 out in one side thereof which mesh with pinions 10 6, journaled in the plates 103.

As shown in FIGURE 9 each pinion 106 has a shaft portion 167 journaled in one plate 103 and an opposite slotted head portion 169 rotatably carried in a nut 1-10 externally threaded and threaded within the opposite plate 1&3 from the shaft portion 197. The pinion 106 may thus be turned by a screw driver or the like to position the cutting end of the die 101 in proper position to thread a desired article. The nut 110 may then be turned against a shouldered portion 111 of the pinion 106, to retain the pinion 106 and threading dies 101 in position.

In FIGURES 10 and 11 I have shown a cutter mounted on the rotatable retainers or dowels 23, for cutting a desired article. As shown in these figures, the cutter comprises a casing 115 in the form of two annularend plates 116 connected together in spaced apart relation with respect to each other, as by machine screws 117. The inner peripheries of the annular end plates 1.16 are connected together by a sleeve 119 while the outer peripheries of said end plate are connected together by'a sleeve 120. A series of radial guides 121 are disposed between the end plates .116 and form guides for a series of knives 123, guided therein for radial movement with respect to the casing 115. Each knife 123 is shown as having rack teeth 124 extending along one side thereof and meshed with a gear 125 on a shaft 126, journaled at its ends in the end plates 116. A pinion 127 on the shaft 126 meshes with and is driven by a gear 129 on shaft 13%, journaled at its ends in the end plates 116. A pinion 131 on the shaft 13%) meshes the teeth of a gear sector 133 mounted on ashaft 135 rotatably mounted at its ends in end plates 116. A torsion spring 136 is shown in FIGURE 11 as encircling the shaft 135 and biases the gear sector 133 in a direotion to retractably move the cutters 123. The spring 136 is connected at one end to said shaft, as indicated by reference character 13-7, and is connected at its opposite end to the inner end plate 116, as indicated by reference character 168. p

The cutters 123 are extensibly moved toward the center of rotation of the casing 115 by means of levers 139 pivotally mounted intermediate their ends on pivot pins 140 extending transversely of the rotational axes of the sleeve 120. Each lever 139 has a camming inner end portion 142 extending within an opening 144 in the outer end plate V116 and having camming engagement With the outer end of an actuating rod 145 for the gear sector 13 3. Each actuating rod '145 is slidably guided between the plates 116 in a separate radial guide 146, extending inwardly of the outer plate 116, and has an end portion 147 extending at right angles to said rod,

through a radial slot 149 formed in the gear sector 133.

7 Pivotal movement of the lever 139 in a direction, which in FIGURE 11 is shown as being a counterclockwise direction, will pivotally move the gear sector 133 in a similar direction through the rod 145, and will move the cutters 123 radially toward the center of casing 115.

The torsion spring 136 biases the rod 145 into engagement with the camming surface of the lever 139 and biases the lever 139 to engage a feed disc or wheel 151 threaded on the periphery of the outer sleeve portion 120 of the casing 115, for axial movement along said casing upon rotation of said feed wheel.

The feed wheel 151 may be turned by hand to position the cutters 123 into engagement with the pipe or rod to be cut. Pressure may then be applied to said feed wheel by the fingers to hold the feed wheel from rotat ing as rapidly as the casing 115 is rotated and thereby gradually feed the cutters into the pipe or rod to be cut.

The operator may maintain sufficient pressure on the feed wheel to feed the cutters to cut the required depth and to entirely sever an article where desired. When an article has been cut to the required depth, or has been severed, the direction of rotation of the feed wheel 151 may be reversed to effect axial movement of said feed wheel 151 toward the inner side of the casing 115, the torsion spring 136 moving the gear sector 133 in a direction to return the respective cutter 123 and maintaining the lever 139 into engagement with said feed wheel 151.

It should here be understood that if the article being worked upon is held on the stationary dowels, the cutter is on the rotating dowels and rotates with said dowels. The cutter also turns at a relatively low rate of speed and when the operator has finished cutting to the required depth, the feed wheel 151 is spun by hand in the direction of cutter rotation and at a greater speed than the speed of rotation of the cutters. This relieves pressure from the levers 139. The torsion springs 136 may then retract the cutters 123.

On the other hand where the cutter is mounted on the stationary dowels and the chuck is mounted on the rotating dowels and rotates the article being worked upon with said dowels, the operator turns the feed wheel 151 at a relatively low rate of speed until the desired depth of out has been attained. It then is merely necessary to reverse the direction of rotation of the feed wheel 15 1 by hand to withdraw the cutter from the work.

As shown in FIGURES l and 11 the casing 115 is mounted on the rotatable dowels 23 and is retained in position on said dowels, as by the spring clips 24 engaging the outer grooves 26 in said dowels. The spring clips 24- may be of any well known construction, and are herein shown as being of a scissor like form including a pair of lovers 155, pivoted intermediate their ends and having semi-annular end portions 156 at one end thereof, engageable within the selected groove in the retainer or dowel 23 and resiliently maintained in engagement with said groove as by a spring 157 seated between the opposite ends of the levers 155. While I have shown a particular form of spring clip herein, it should be understood that snap rings of well known forms or various other detachable retainers may be provided for retaining the cutters or various die stocks to either the rotatable dowels 123 or the stationary dowels 33.

In FIGURE 12 I have shown a form of internal reamer that may be used to ream a hollow object. As shown in FIGURE 12, the reamer includes a spider like frame 160 having, an annular flange 161 extending about the inner side thereof, and having four equally spaced holes 163 leading therethrough, for mounting the spider on either the stationary dowels 23 or the rotatable dowels 33. The spider 160 has a hub portion 164 having a squared socket 165 therein for slidably receiving a squared end 166 of a threaded shaft 167. The shaft 167 is shown as having a reamer 169 mounted on its outer end. The rearner 169 is shown as being in the general form of a disc having a serrated conical reaming face 170. A hand wheel 171 is rotatably mounted on the threaded shaft 167 and abuts a shoulder portion 173 of the spider 169, to effect axial movement of the threaded shaft 167 to feed the reamer 169 into the article to be reamed during rotation of the article, where the reamer may be mounted on the stationary dowels 33. It should be understood, however, that the reamer may be mounted on either the stationary or the rotatable dowels and that where the reamer is used to ream a pipe or other hollow article, suitable jaws (not shown) may be substituted for the jaws 83, which will hold the pipe from axial as well as rotatable movement.

It may be seen from the foregoing that I have provided a simple form of power driven universal tool which may be used for threading and cutting pipes, rods and the like and which may also tighten and loosen pipe or rod couplings and nuts or bolts by power in a simple operation.

It may further be seen that the cutting tool consists simply in a portable power unit having a hollow rotor through which the article being worked upon may extend during an operation thereon, and having stationary retainers projecting from one side of the power unit and ro tatable retainers driven by the power unit and projecting from the opposite side thereof, and that a wide variety of tools and holding devices may be placed on either the stationary or the rotary retainers to effect a desired operation.

While I have herein shown and described one form in which my invention may be embodied, it may be understood that various modifications and variations in the invention may be attained without departing from the spirit and scope of the novel concepts thereof, as defined by the claims appended hereto.

I claim as my invention:

1. In a universal portable power tool, a casing, a motor having a hollow rotor mounted within said casing, a sleeve rotatably journaled within said hollow rotor and having a drive gear at one end thereof and a socket at the opposite end thereof in communication with said sleeve, a plurality of retainers projecting outwardly from said socket and adapted to interchangeably support a selected tool for working on an article, a plurality of stationary retainers projecting from the opposite side of said casing outwardly of said sleeve and adapted to support a holding device for an article to be worked upon, a geared drive connection from said motor to said annular gear for rotatably driving said annular gear and socket, said geared drive connection including two circumferentially spaced idler pinions and geared drive trains driving said pinions at different speeds, a change speed disc detachably mounted on said stationary retainer and positionable in two different positions on said retainer, said change speed disc having two circumferentially spaced drive pinions rotatably carried thereby and meshing with said annular gear in each position of said change speed disc, and meshing with one idle-r pinion in one position of said change speed disc and with the other idler pinion in another position of said change speed disc.

2. In a universal portable power tool, a casing, a motor having a hollow rotor carried within said casing, a sleeve rotatably journaled within said hollow rotor andhaving a drive gear at one end thereof and a socket at the opposite end thereof, a plurality of spaced retainers projecting from said socket and adapted to interchangeably support tools for working on pipe and the like, a geared drive connection from said rotor to said drive gear, for rotatably driving said socket, a plurality of stationary retainers projecting from the end of said casing opposite from said socket and spaced outwardly of said sleeve and adapted to support a chuck and the like, said geared drive connection including two idler pinions, a high speed gear train for driving one idler pinion at one speed, a low speed gear train for driving the other idler pinion at a lower speed, a change speed disc detachably mounted on said stationary retainers, and said change speed disc being invertibly mounted on said stationary retainers and havingtwo drive pinions removably mounted thereon to project from either side of said disc, said drive pinions meshing with said drive gear and one of said idler pinions in one postion of said disc and meshing with said drive gear and the other of said idler pinions upon inversion of said disc on said retainers and reversal of the drive pinions carried thereby.

3. A universal portable tool in accordance with claim 2 wherein the casing has hollow handles projecting diamet rically therefrom, and wherein a switch ring is rotatably mounted on one of said handles and switch means operated by said switch ring are carried within said hollow handle.

4. In a universal portable power tool for pipe and the like, a casing having a sleeve journalled therein and opening to opposite ends thereof, a motor within said casing and having a hollow rotor concentric with said sleeve and extending thereabout, a plurality of stationary dowels extending from one end of said casing and spaced radially of said sleeve, a plurality of rotatable dowels extending trom the opposite end of said casing and mounted on and rotated by said sleeve and spaced radially from the axis of rotation of said sleeve, said stationary and rotatable dowels being adapted to interchangeably retain holding devices and working tools for performing a working operation, an

annular gear on said sleeve, d-rive gearing within said casing driven by said motor for driving said sleeve and rotatable dowels, and the drive connection from said drive gearing to said annular gear comprising a change speed disk having a series of drive gears carried thereby for changing the speed of rotation of said rotatable dowels about the axis of rotation of said sleeve by changing the position of said change speed disk.

5. In a universal portable power tool for pipe and the like, a casing having a sleeve journalled therein and opening to opposite ends thereof, a motor within said casing having a hollow rotor, the hollow interior portion of which is concentric with and extends about said sleeve, a plurality of stationary dowels spaced radially from said sleeve and extending from one end of said casing parallel to the axis of rotation of said sleeve, a plurality of rotatable dowels spaced radially from the axis of rotation of said sleeve and extending parallel thereto from the opposite end of said casing from said stationary dowels and mounted on and rotated by said sleeve, certain of said dowels being adapted to detachably support a holding device for an article being worked upon and certain other of said dowels being adapted to detachably support a tool for I working on the article, an annular gear on said sleeve, an

annular gear driven by said hollow rotor, drive gearing within said casing driven by said annular gear on said hollow rotor and including a high speed gear train and a low speed gear train, and a change speed disk having at least two drive pinions rotatably journalled thereon, each meshing with said annular gear on said sleeve, one of said drive pinions being driven from said high speed gear train in one position of said disk and the other of said drive pinions being positioned to be driven from said low speed gear train upon a change in position of said disk.

6. In a universal portable power tool for pipe and the like, a casing having a sleeve journalled therein and opening to opposite ends thereof, and accommodating an article being worked upon to pass therethrough, a motor within said casing having a hollow rotor encircling said sleeve and coaxial with the axis of rotation thereof, a plurality of stationary dowels spaced radially outwardly from the axis of rotation of said sleeve and extending parallel thereto from one end of said casing, a plurality of rotatable dowels extending from the opposite end of said casing parallel to the axis of rotation of said sleeve and spaced radially outwardly therefrom and mounted on and rotated by said sleeve, and an annular gear on said sleeve, an

annular gear driven by said rotor, drive gearing driven by said annular gear driven by said rotor including two c1rcumferentially spaced idler pinions journalled within said casing, a high speed gear train driving one of said pinions, a low speed gear train driving the other of said pinions, a change speed disk detachably mounted on said stationary dowels for inversion with respect to said casing, 531d change speed disk having at least two circumferentially spaced drive pinions rotatably mounted on opposite sides of said disk, one of said drive pinions meshing with one of said idler pinions and said annular gear on said sleeve in one position of said disk, and the other of said drive pinions meshing with the other of said idler pinions and said annular gear on said sleeve in an inverted position of said disk.

7. In a universal portable power tool for pipe and the like, a casing, a motor within said casing and having a. hollow rotor, a sleeve journalled in said casing coaxial with the axis of rotation of said rotor and extending through the hollow interior portion of said rotor and opening to opposite ends thereof and driven by said rotor, an end plate for one end of said casing having a central open portion registering with said sleeve, a plurality of stationary dowels carried by and projecting from said end plate parallel to the axis of rotation of said sleeve and spaced radially of the central open portion of said end plate, a plurality of rotatable dowels carried by said sleeve and projecting from the opposite end of said casing from said stationary dowels in radially spaced relation with respect to the axis of rotation of said sleeve to accommodate an article being worked upon to pass through said sleeve, said stationary and rotatable dowels being adapted to interchangeably retain chucks and tools thereto, to hold the article being worked upon from free rotation and to perform a work operation thereon, an annular gear on said sleeve and disposed within said casing, a geared drive connection from said hollow rotor to said annular gear, said casing having hollow handles projecting therefrom, and switch means within one of said handles and operable from the outside of said handle to control rotation of said motor and rotatable dowels.

8. A universal portable power tool comprising a casing having two handles projecting from opposite sides thereof, at least one of which is hollow, a motor carried within said casing and having a hollow rotor, a switch operating member mounted on said hollow handle and switch means operated by said member carried within said hollow handle for controlling operation of said motor, a sleeve extending along said hollow rotor, concentric therewith and opening to opposite ends of said casing to accommodate an article to be worked upon to pass through the hollow interior portion of said rotor, means journalling said sleeve for relative rotation with respect to said hollow rotor, a ring gear on said sleeve and a geared drive connection between said hollow rotor and said ring gear, a plurality of stationary dowels projecting from one end of said casing parallel to and spaced radially from the axis of rotation of said sleeve, a plurality of rotatable dowels projecting from the opposite end of said casing parallel to the axis of rotation of said sleeve and mounted on and rotatably driven by said sleeve, and a chuck and a cutting tool interchangeably mounted on said stationary and said rotatable dowels to hold a workpiece within said sleeve and efiect a cutting operation thereon.

9. In a portable power tool for pipe and the like, a casing, a motor mounted within said casing and having a hollow rotor, a sleeve encircled by said hollow rotor and journalled for relative rotation with respect thereto, a ring gear on said sleeve, a ring gear on said rotor and a geared drive connection from said ring gear on said rotor to said ring gear on said sleeve, stationary dowels carried by and projecting from one end of said casing and spaced radially of said sleeve and extending parallel to the axis of rotation thereof, a plurality of rotatable dowels carried by said sleeve and projecting from the opposite end of said casing from said stationary dowels and extending axially from said sleeve in radially spaced relation with respect to the axis of rotation thereof, and chuck means for interchangeably mounting on said stationary and said rotatable dowels including an annular frame having an open central portion registering with the hollow interior portion of said sleeve, a plurality of jaw members guided in said frame for radial movement with respect thereto, an annular gear rotatably mounted mvithin said casing, said jaw members being bifurcated and slidably extending along opposite sides of said annular gear and having racks thereof, pinions meshing with said annular gear and racks, and a disk extending about said annular gear and connected therewith for turning said annular gear by hand to bring said jaw members into biting engagement with an article to be held.

10. A portable power tool for pipe and the like in accordance with claim 9 in which a pin and slot connection is provided between said disk and said annular gear to ac commodate the engagement of said disk with said annular gear with an impact upon the spinning of said disk by hand.

References Cited in the file of this patent UNITED STATES PATENTS Mulvaney June 16, 1885 Oster Oct. 3, 1916 Cutler Apr. 21, 1925 Whiton May 21, 1929 Elliott Apr. 21, 1931 Pealer Oct. 18, 1932 Bird July 13, 1943 Ardussi May 4, 1948 Hutchinson Mar. '17, 1953 Nygren Oct. 19, 1954 Budnicl: Dec. 16, 1958 Goodrurn Apr. 21, 1959 Iams June 28, 1960 Leiss May 23, 1961 

1. IN A UNIVERSAL PORTABLE POWER TOOL, A CASING, A MOTOR HAVING A HOLLOW ROTOR MOUNTED WITHIN SAID CASING, A SLEEVE ROTATABLY JOURNALED WITHIN SAID HOLLOW ROTOR AND HAVING A DRIVE GEAR AT ONE END THEREOF AND A SOCKET AT THE OPPOSITE END THEREOF IN COMMUNICATION WITH SAID SLEEVE, A PLURALITY OF RETAINERS PROJECTING OUTWARDLY FROM SAID SOCKET AND ADAPTED TO INTERCHANGEABLY SUPPORT A SELECTED TOOL FOR WORKING ON AN ARTICLE, A PLURALITY OF STATIONARY RETAINERS PROJECTING FROM THE OPPOSITE SIDE OF SAID CASING OUTWARDLY OF SAID SLEEVE AND ADAPTED TO SUPPORT A HOLDING DEVICE FOR AN ARTICLE TO BE WORKED UPON, A GEARED DRIVE CONNECTION FROM SAID MOTOR TO SAID ANNULAR GEAR FOR ROTATABLY DRIVING SAID ANNULAR GEAR AND SOCKET, SAID GEARED DRIVE CONNECTION INCLUDING TWO CIRCUMFERENTIALLY SPACED IDLER PINIONS AND GEARED DRIVE TRAINS DRIVING SAID PINIONS AT DIFFERENT SPEEDS, A CHANGE SPEED DISC DETACHABLY MOUNTED ON SAID STATIONARY RETAINER AND POSITIONABLE IN TWO DIFFERENT POSITIONS ON SAID RETAINER, SAID CHANGE SPEED DISC HAVING TWO CIRCUMFERENTIALLY SPACED DRIVE PINIONS ROTATABLY CARRIED THEREBY AND MESHING WITH SAID ANNULAR GEAR IN EACH POSITION OF SAID CHANGE SPEED DISC, AND MESHING WITH ONE IDLER PINION IN ONE POSITION OF SAID CHANGE SPEED DISC AND WITH THE OTHER IDLER PINION IN ANOTHER POSITION OF SAID CHANGE SPEED DISC. 